Routing Internet Traffic Through A Site-To-Site OpenVPN Tun- nel

This article shows how to create a site-to-site connection using OpenVPN and how to route the Internet connection of site A through site B using AZTCO-FW software.

This is effectively the same as using an IPsec site-to-site connection except that we’ll be using OpenVPN instead of IPsec. Using OpenVPN as the ‘back-end’ means we need to set up one side as a server and the other as the client. It doesn’t matter which one is which but if more than two sites are connected in a star topology it seems natural to use the center of the star as the server. The server also needs to have a dedicated port mapped to it if it’s behind another router, or is must reside in its DMZ.

For the purpose of this article:

• Site A is a branch office, LAN subnet 192.168.10.0/24
• Site B is the main office through which all Internet traffic is routed, 192.168.20.0/24